Main unit of entrance television phone system



FIG. 1 is a front perspective view of a main unit of entrance television phone system of the present invention;

FIG. 2 is a rear perspective view thereof;

FIG. 3 is a front view thereof;

FIG. 4 is a first side view thereof;

FIG. 5 is a rear view thereof;

FIG. 6 is a second side view thereof;

FIG. 7 is a top view thereof; and,

FIG. 8 is a bottom view thereof. 

The ornamental design for a main unit of entrance television phone system, as shown and described. 